Process for spraying materials



Jan. 1, 1935. F, R. sEAvEY Er Al. 1,986,292

PROCESS FOR SPRAYING MATERIALS Filed April 10, 1929' Patented jan.' 1, 1935 UNITED lSTATES PATENT OFFICE PROCESS FOR SPRAYING MATERIALS Frederick R. Seavey, Albert J. Phillips,A and Fredrich Olsen, Dover, N. assignors, by direct and mesne assignments, to The Cellulose Research Corporation, a corporation of Delaware Application April 10, 1929, Serial No. 354,110

2 Claims. (Cl. 8 2) This invention relates to a process and appa- Fig. is an enlarged detailed view of the disratus for coating sheet lmaterials and the like tributor of the apparatus shown in. Figs. 3 and 4. and more particularly to a process and appara- In the apparatus for carrying out this process tus for treating paper and paper pulp with a shown in Figs. 1 and 2 a hood 10 is formed from 5 bleaching solution. sheet material having preferably a rounded top 5 Sodium bi-sulphite and other bleaching soluand perpendicular side and endportions with tions for bleaching paper pulp and the like have an open bottom portion beneath which the sheet been used heretofore but these solutions have material 1l to be bleached or colored, such as a been unsatisfactory because of the difliculty in sheet of paper pulp, paper or fabric, is passed. uniformly distributing the solutions, the eX- Upon either side of the hood are located a l0 treme care which must be utilized in handling series of spray nozzles 12 vof non-corrosive'matesome of the solutions vbecause of their strong rial, if bleaching solutions are used, such as corrosive properties'and the formation of crysbakelite or resistive alloys having an inlet 13 tals if and when the solutions are hot and nearfor the bleaching solution or coloring material ly saturated, and an air inlet 14. The air atomizes the l5 The main object of this invention is to overbleaching solution or coloring material and it come these objectionable features in using passes from the nozzle in a fine spray which unibleaching solutions such as sodium bi-sulphite formly and evenly contacts with the surface of as a bleach for paper, paper pulps and the like the sheet of paper pulp or other material as lo and to provide a new and improved process and clearly shown, bleaching or coloring the same apparatus for evenly and uniformly distributing uniformly as it passes beneath the hood. The bleaching solutions ov'er the surface of the temperature of the bleaching solution or colorpaper pulp.` ing material has a decided eiect upon the size A further object of the invention is to provide of the drops of the liquids. a process for uniformly distributing the bleach- It is of extreme importance that drops of ing solution over the surface of the paper pulp bleaching solution or coloring material of suffiin the form of a fine spray. cient magnitude to contain a concentration of A further object of the invention is to provide bleaching solution or coloring material in excess a process and apparatus for coating paper or of that produced by the spray nozzles be prel fabrics to produce decorative effects thereon. vented. from contacting with the sheet of paper In attaining these objects we provide a hood pulp or other material. For this purpose a series open at the bottom and provided with a meof bales 15 are provided within the hood which chanical means for converting the sodium biextend completely around the hood and may sulphite or other bleaching solution or coloring progress in width as they near the bottom of the materials into a ne spray with baffle means to hood, catching any drops from the spray nozzles 35 catch any large drops of bleaching solution or which, due to their larger mass, will be thrown coloring materials in order to prevent them fallto tne sides of the hood. These bales 15 are ing upon the surface of the paper pulp or other spaced from the sides of the hood and supported sheet material where they would cause spots on brackets 16 secured to the sides of the hood so because of the concentration of bleaching soluthat the accumulated bleaching material or col- 40 tion therein or concentration of coloring mateoring material will flow downwardly from one to rial. the other. The rounding of the top of the hood Other objects and advantages will be apparalso prevents accumulation of drops thereon as ent from the following specification and accornthe bleaching material or coloring material panying drawing, in which therefrom runs down the sides of the hood and 45 Fig. l is a diagrammatic view of one form of does not accumulate in drops. 'Ihe drops from apparatus for carrying out the process of this the ballles are collected by adrip pan or collectinvention. ing trough 17 located on the inside of the hood Fig. 2 is a sectional view of the apparatus which is connected toa storage tank for the shown in Fig. 1. bleaching solution or coloring material by pipe 50 Fig. 3 is a sectional view of another apparaconnection 18. tus for carrying out the process of this inven- In bleaching paper and in coating or coloring tion. many types of objects, it is frequently impera- Fig. 4 is a horizontal sectional view taken on tive to avoid the application of large crops to line 4-4 of Fig. 3, and these materials, since a large drop of blcacllng 65 liquor will produce an uneven whitening, a large drop of colored fluid will produce an undue con centration oi color at the place of application. This invention provides a means whereby large drops may be separated from the small and desired drops by the use of a series of baes l5.

In the apparatus shown in Figs. 3, and 5 the process is carried out within a cylindrical hood 19 provided with an open bottom and progressive bafiie plates 20 circling the inside of the hood from which the drops collected thereby flow to the collecting trough 21 on the inside of the hood.

The atomizing of the bleaching solution or coloring material is carried out by means .of a rapidly rotating horizontal spray wheel or wheels 22 provided with an oblique edge 23 which is ribbed or serrated to provide points to break up the bleaching solution or coloring material into ne particles to form a fine spray as it is thrown outwardly by centrifugal force. The spray wheel 22 is conveniently secured rigidly to the end of the shaft 24 of the motor 25 which extends through the top of the hood 19. The motor is held in position by a frame work 26 secured to the top of the hood 19. The bleaching solution or coloring material is fed to the spray wheel 22 by means of a feed pipe 27, one end of which extends through the top of the hood 19 and terminates in close proximity to the center of the spray wheel.

'Ihe size of the drops and the intensity of the mist or spray may be regulated by the rate at which the liquid is dropped upon the wheel, the peripheral speed and position of the wheel and the form of the wheel and temperature of the liquid. Further regulation may be provided by the use of more than one feed pipe and the use of more than one wheel or the change in position of inlet pipe above spray wheel.

Decorative effects upon paper or fabrics may meanest be created by this process and apparatus, for

`example a sheet material having lighter bands of coloring material than the remainder of the coated` surface can be made by the insertion of baiiie troughs such as shown in dotted lines at 28 extending from the lower collecting trough 17.

While the invention is illustrated and described more particularly with reference to a process and apparatus'for bleaching or coloring materials, the invention is not confined thereto but is intended to cover any other bleaches, coloring materials or apparatus suitable for carrying out the process and any other uses or modifications within the scope of the appended claims.

We claim:

1. The process of treating sheet materials which consists in spraying a fluid treating medium into a chamber in opposite directions and toward opposite sides, trapping any large drops of spray on each side while leaving an unobstructed vcenter space below the entry of said spray, and permitting the resultant ne, evenly divided spray to pass down through said center space and contact with the materials to be treated.

2. The process of treating sheet materials which consists in spraying a fluid treating medium into a chamber in opposite directions and toward Opposite sides so that said sprays cross each other near the center of said chamber, trapping any large drops of spray on each side while leaving an unobstructed center space below the entry of said spray, and permitting the resultant fine, evenly divided spray to pass down through said center space and contact with the materials to be treated.

FREDERICK R. SEAVEY. ALBERT J. PHILLIPS. FREDRICH OLSEN. 

